“Due to a viral illness to UFC flyweight contender Ray Borg, the main event bout against champion Demetrious Johnson has been cancelled. Borg was deemed unfit to compete by the UFC medical team.”

Though the card will take place as scheduled, full refunds are being offered to ticket holders.

The Borg-Johnson fight was to be Johnson’s 11th defense of his flyweight title. With a victory, he would have broken Anderson Silva’s record for consecutive successful defenses.

Borg’s nutritionist, Dr. Michelle Ingels of Perfecting Athletes, told Helwani that Borg’s withdrawal was not related to any difficulties making the 125-pound flyweight limit. Borg twice has come in overweight for fights but said last week that making weight for Saturday’s fight would not be a problem.

“It wasn’t weight related,” Ingels said. “Ray has been getting progressively more sick each day this week and still wanted to fight so badly that he put on his game face and went to all of his fight week obligations.

Borg has not yet commented. Johnson, his coach said, is “beyond disappointed.”

The fight will be rescheduled, mmafighting reported, but there are not yet definitive plans.

This is the second time Borg has had a fight scrapped because he fell ill. A scheduled fight against Ian McCall was canceled in September 2013 and was not rescheduled.